Missile Command 4-4-82
This is the only PAL 5200 Missile Command prototype known to
exist. The code is different than the NTSC version, but
there are only a handful of noticeable changes. The first
change is that in the code there is a variable set to successfully
pass an NTSC/PAL cartridge check which was to be introduced with
PAL 5200s in an attempt to block NTSC games from running on PAL
systems. This check (introduced with the 2 port BIOS) would
only be triggered on a PAL 5200 which was never released and can
only be seen if running in an emulator.
Next, the splash screen has copyright of 1981 instead of 1982
for some inexplicable reason even though the 5200 wasn't released
until 1982 and the PAL version was to be released in 1983!
It's not even the arcade game's copyright date as that would be
1980. I have no explanation as to why this was changed other
than by error.
There also appears to be an error in the screen height when
played on an actual PAL 5200 (these don't exist so you need to use
an emulator). Normally the regular NTSC version of the game
sets the screen size a little larger to compensate for PAL
displays, this prototype doesn't do that so it looks squashed if
played on a PAL 5200. Once again, this can only be seen on a
PAL 5200 (which doesn't exist) or an emulator.
Finally there's the speed. Since the prototype is
tied to the refresh rate of the screen the whole game runs
slower. Oddly the retail NTSC version runs at a normal
speed on a PAL 5200. It seems that this prototype was a
first attempt at trying to get the timings down for PAL systems.
You can't tell by the screenshot,
but the game runs about 4 seconds slower than the
Notice how the image is compressed?
Here's a normal screenshot for
to Missile Command